Java Cloud Developer (f/m/x)

Sii Poland; Warszawa; On-site; PLN 140,000 - 210,000; Full time

Job summary

Sii Poland is seeking an experienced Java Cloud Developer to join a dynamic team delivering modern digital solutions for business clients. You will work on virtual card services and scalable platforms supporting innovative models such as Click & Collect and fleet management.

You will contribute to end-to-end development across mobile and web applications and external APIs, with a focus on Java, Spring, cloud, and containerization.

Qualifications

• At least 4 years of hands‑on experience in Java development.
• Strong knowledge of Spring, JUnit, Spock, JPA, Hibernate.
• Experience with PostgreSQL, SQL, NoSQL and Redis.
• Cloud and containerization: Azure, Kubernetes, Docker.
• Experience building REST/SOAP APIs and Swagger/OpenAPI docs.
• CI/CD tools: Jenkins, SonarQube, Git, Gradle.
• Excellent English and Polish communication, residence in Poland.

Responsibilities

• Design and implement new features and system improvements.
• Ensure software quality through testing and validation against requirements.
• Diagnose, troubleshoot, and resolve technical issues.
• Collaborate with cross‑functional teams in an agile environment.
• Participate in team ceremonies and contribute to technical discussions.
• Prepare and maintain technical documentation.

Skills

Java

Spring Framework

CI/CD

English

Polish

Tools

PostgreSQL

SQL

NoSQL

Redis

Azure

Kubernetes

Docker

Jenkins

SonarQube

Git

Gradle

Swagger/OpenAPI

Job description

We are looking for an experienced Java Cloud Developer to join a dynamic team delivering modern digital solutions for business clients. You will be part of a product area focused on virtual card services and digital platforms that support innovative business models such as Click & Collect and fleet management solutions.

Those systems enable end-to-end management of payments and communication with business customers, including fueling, car wash services, invoicing, and card/account management. The portfolio spans both mobile and web applications, as well as external APIs (e.g., Payment-as-a-Service), serving primarily Scandinavian and Baltic markets. You’ll work across a mix of greenfield development and enhancements to existing systems.

Your tasks

• Design and implement new features and system improvements
• Ensure software quality through testing and validation against requirements
• Diagnose, troubleshoot, and resolve technical issues
• Collaborate with cross-functional teams in an agile environment
• Participate in team ceremonies and contribute to technical discussions
• Prepare and maintain technical documentation

Requirements

• At least 4 years of hands‑on experience in Java development
• Strong knowledge of frameworks and tools: Spring (Boot, Data, Cloud), JUnit, Spock, JPA, Hibernate
• Solid experience with PostgreSQL, SQL, NoSQL databases, and Redis
• Practical experience with cloud and containerization technologies (Azure, Kubernetes, Docker)
• Experience building and integrating REST/SOAP APIs, including Swagger/OpenAPI documentation
• Familiarity with CI/CD and development tools: Jenkins, SonarQube, Git, Gradle
• Very good communication skills in both English and Polish
• Residing in Poland required

Nice to have

• Knowledge of TDD/BDD practices, e.g., Spock, Mockito, Cucumber
• Basic understanding of Domain-Driven Design (DDD)
• Familiarity with service mesh architectures

Job no. JOB-MXLY9

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.

Benefits For You

• Great Place to Work
• Solid financial situation
• Contracts with the biggest brands
• Centre of internal trainings
• Many experts you can learn from
• Open and accessible management team
• Profit sharing
• Passion Sponsorship program
• Regular integration events and trips
• Comfortable and well-equipped offices
• MySii app
• Medical care